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Old 09-23-2019, 10:26 AM   #1
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Default Efficacy of Solar in 2019

Well here we are in the year 2019.

When it comes to turning on your car headlights as the day gets darker, I was taught to turn them on when half the other cars have theirs on. If I relate that to solar, it's not time. But I'm curious about it.

I'd expect having solar on my roof would lessen my heat gain in the building? I have a 90 lb modified bit roof. Covering that, at least partially, would reduce heat gain.

I pay for about 4k kWh of electricity per month (4MWh).

I have 2 services, both 200A 120/208 Y.

How much would it cost me today to install solar using an EC?
What's my power bill going to be?
How long will the system last?

You'd think my highest energy consumption would be the reflow oven, but it's not. It's the A/C.
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Old 09-27-2019, 09:21 PM   #2
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Well here we are in the year 2019.

When it comes to turning on your car headlights as the day gets darker, I was taught to turn them on when half the other cars have theirs on.
I would have figured your headlights would have been controlled by a GPS light lock
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Old 09-27-2019, 10:26 PM   #3
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Now that we've been making some 12V units that just might happen. At least an indicator light.
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Old 10-19-2019, 08:47 PM   #4
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I was in a continued ed class a while back and it was covering solar. Very interesting and informative!. Several key notes I took away from it:

1) The solar market/trade is changing so much, that its absolutely impossible to keep up with all the installation standards. If you are a solar contractor right now and you decided to get out for a year or two, when you get back in the industry will have changed so much that it you wouldn't be able to pick it back up without dealing with a huge learning curve.

2) lots of turn over in the solar business

3) the BIGGEST hurdle that the contractors face is the 100's of roof penetrations that get made on every project. That's a lot of worry if you ask me.
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Old 10-19-2019, 09:11 PM   #5
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Get a free quote and listen to the sales pitch. You should be able to gather enough information with a few questions to backwards engineer what they are selling.
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Old 10-19-2019, 09:25 PM   #6
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Now that we've been making some 12V units that just might happen. At least an indicator light.
Not sure if that would sell. Both my car and truck turn on the lights automatically with the light sensor on the dash.

Back in the day, rule was half hour before sunset to have your lights on.
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Old 10-19-2019, 09:28 PM   #7
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Get a free quote and listen to the sales pitch. You should be able to gather enough information with a few questions to backwards engineer what they are selling.
I think finding a good manufacturers is the big problem. Knowing that you could buy some high end equipment today, but they might not be around for you to get parts and service next year doesn't sit right with me. The installation process probably isn't to hard to peice together.
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Old 10-19-2019, 09:50 PM   #8
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Quote:
Originally Posted by MikeFL View Post
Well here we are in the year 2019.

When it comes to turning on your car headlights as the day gets darker, I was taught to turn them on when half the other cars have theirs on. If I relate that to solar, it's not time. But I'm curious about it.

I'd expect having solar on my roof would lessen my heat gain in the building? I have a 90 lb modified bit roof. Covering that, at least partially, would reduce heat gain.

I pay for about 4k kWh of electricity per month (4MWh).

I have 2 services, both 200A 120/208 Y.

How much would it cost me today to install solar using an EC?
What's my power bill going to be?
How long will the system last?

You'd think my highest energy consumption would be the reflow oven, but it's not. It's the A/C.
Mike,
You have to jump on the merry go round at some point.
Once you have the racks installed and the inverter installed, the system should should be both scale able and upgradable.
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Old 11-22-2019, 02:51 PM   #9
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Before installing solar add a layer of solid insulation to the roof and a new membrane. If it is subbed out by the solar installation company then it can be rolled together for the tax credits.

Solar panels have a useful life of more than 50 years and add on average $17,000 to the resale price of a house and a house on the market will sell in half the time of a comparable house without solar.

At the very least contract with a company that will install the panels and provide you with a fixed payment for electricity for you that will not go up in future years, unlike the electrical bill from the utility.

Nothing could be simpler than a solar panel installation. Most have the output as DC which is run in series in EMT to an inverter box and then a transfer switch (so no power goes to the grid when the grid is down). If two different sets of panels are used then the line voltages willl be different but that is easily resolved with a dual string type inverter that houses two inverters in a single box. More and more houses will have panels on different parts of the roof and so even the same number of panels will vary in terms of output voltage and the dual-string inverters handle the situation.

If living in the sunshine state this would be a good time to also wire in a whole-house surge supressor which is very cheap insurance.
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Old 11-22-2019, 11:26 PM   #10
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I am assuming the this is a commercial location. Is it a flat roof? 90 pound modified bit? Is that a torch down type? Anyway check how installing the panels will affect the roof warranty. I have several commercial accounts who had a new roof and the warranty would be affected unless certain guidelines were followed.
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